Influence of a relatively high frequency structure vibrations on the dynamics of real stick-slip motion
Abstrakt
The work concerns the research on the impact of structure vibrations on the dynamics
of frictional contact of bodies moving in relation to each other and remaining in frictional
contact, causing a stick-slip motion. A literature review was carried out, describing
mainly the phenomena concerning friction, but also the dynamics of vibrations and non-ideal
energy sources that induce system oscillations. In the next step an experimental station for investigation
of friction equipped with a new subsystem inducing high-frequency vibrations is
presented to propose a modified physical model of the investigated frictional system. After
analysing the most important factors influencing the behavior of the tested system, a mathematical
description was prepared, which in theory showed the potential influence of the attached
subsystem on the dynamics of the movement of the tested object - the frictional connection.
Various methods of implementing the unbalance of rotors, being the source of highfrequency
excitation, have been considered. At the final stage, a series of measurements of the
displacement of the vibrating block on the moving belt was performed with the highfrequency
excitation turned on and off. The prepared graphs were used to analyse the dynamics
of frictional contact and the impact of non-autonomous vibrations on the occurrence of the
stick-slip phenomenon.